A homogenization enhancing thermoplastic foam extrusion screw

Details A homogenization enhancing thermoplastic foam extrusion screw A homogenization enhancing thermoplastic foam extrusion screw

B - Operations, Transporting

29

C

B29C 47/38 (2006.01) B08B 9/00 (2006.01) B29B 7/42 (2006.01) B29B 7/46 (2006.01) B29B 7/48 (2006.01) B29B 7/82 (2006.01) B29C 44/34 (2006.01) B29C 47/60 (2006.01) B29C 47/64 (2006.01) B29C 47/78 (2006.01) B29C 47/82 (2006.01) C07D 261/12 (2006.01) H01L 21/203 (2006.01)

Patent

CA 2301118

A foam extrusion assembly having a melt region wherein a plurality of material pellets are melted and mixed by a mixing assembly with a blowing agent introduced via an agent addition assembly. The foam extrusion assembly further includes a heat extraction region structured to extract excess heat from the mixture of melted material pellets and blowing agent such that the mixture achieves an extrudable temperature. The heat extraction region includes an elongate barrel having at least one inlet and at least one outlet, the inlet being structured to receive the extrusion mixture therethrough for passage into the barrel wherein a heat extraction structure cooperatively disposed with the barrel draws heat therefrom. An extrusion screw is disposed in the barrel and includes at least one screw flight structured to rotate within the barrel and urge the extrusion mixture towards the outlet of the barrel where a die is disposed in order to form the finished product. Moreover, the screw flight includes at least one circulation channel defined therein and structured to receive quantities of the extrusion mixture therethrough upon rotation of the extrusion screw, thereby circulating the extrusion mixture towards the barrel for more effective and uniform cooling of the extrusion mixture to an extrudable temperature prior to passage through the die.

La présente invention concerne un ensemble d'extrusion de mousse (10) présentant une zone de fusion (20) et une zone d'extraction de chaleur (40) qui extrait l'excédent de chaleur d'un mélange de granules de matière fondue et d'un agent d'expansion. La zone d'extraction de chaleur comprend un cylindre allongé (50) possédant au moins une entrée (31) et au moins une sortie (44), l'entrée recevant le mélange d'extrusion pour le faire passer dans le cylindre où une structure d'extraction de chaleur disposée de façon à coopérer avec le cylindre en extrait la chaleur. Une vis d'extrusion (60) placée dans le cylindre comprend au moins un filet (64) structuré pour tourner à l'intérieur du cylindre et pousser le mélange d'extrusion vers la sortie du cylindre où est placée une filière (44) destinée à former le produit fini. Le filet (64) comprend un canal de circulation (90) qui reçoit des quantités du mélange d'extrusion lorsque la vis d'extrusion tourne, faisant de la sorte circuler le mélange d'extrusion vers le cylindre afin d'obtenir un refroidissement plus efficace et uniforme du mélange d'extrusion jusqu'à une température d'extrusion.

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